An ablation probe, comprises a tubular shaft (101) and a coaxial feedline (102) disposed within the tubular shaft. The coaxial feedline includes an outer conductor. A balun short (110) is disposed in electrical communication around the outer conductor. The balun short includes at least one longitudinal notch (111) defined therein. An inflow tube (140) is disposed longitudinally along the outer conductor and at least partially within the at least one longitudinal notch.
